Korean Air announced on Apr. 22 that it will increase its codeshare services with China Southern Airlines from the current two routes -- Incheon-Shenyang and Incheon-Guangzhou -- to six beginning Apr. 28.

The new routes are between Incheon and Beijing, Shanghai, Dalian and Changsha, and the two airlines can book and sell each other's seats without restrictions.

This partnership will increase the number of weekly codeshare flights from the current 25 to 136.